Phonograph record



T. D. JONES AND J. H. BARR.

M. BARR, EXECUIHIX'OF i. H= BARR, DEC'D. PHONOGRAPH RECORD.

1 APPLICATION FILED FEB. 7. 1921. Patented Aug. 8 1922.

THOMAS DOUGLAS JONES AND JOHN H. BARR, OF KANSAS CITY, MISSOURI; MARYBARR EXECUTRIX OF SAID JOHN H. BARR, DECEASED.

PHONOGR APH RECORD.

Specification of Letters Patent.

Patented Aug. 8, 1922.

Application filed February 7, 1921. Serial No. 443,002..

To all whom 1'1 may concern:

Be it known that we, THOMAS DOUGLAS JoXEs and JOHN H. BARR, citizens ofthe l'nited States. and residents of Kansas City, county of Jackson.State of Missouri, have invented a. certain new and useful Improve mentin lhonograph Records, of which the following is a completespecification.

This invention relates to phonograph disk records and has for its objectto produce a record provided within the space surrounded by the soundreproducing grooves, with a score or groove to receive the needle afterthe sound reproduction has been accomplished, and guide the needleinward and then outward with respect to the axis of the record. andthereby eventually reveise the travel imparted to the tone arm by theengagement of the needle with the sound reproducing grooves of therecord, this reverse or outward travel of the tone arm being utilized toefiect the operation of the brake mechanism to arrest the rotation ofthe record. The mechanism in contemplation for actuation by the outwardmovement of the tone arm. will form the subject matter of anotherapplication for patent, and hence is not illustrated or describedherein.

Vith this object in view the invention consists in the provision in the.face of the record. of a scoring or groove intersecting at its outermostpoint. one of the non-reproducing grooves or the trem'ity of the finalsound reproducing groove of the record, and extending first inward andthen outward ,toward but not be- 'ond the said non-reproducing orinnermost extremity of the final sound-reproducing groove. ashereinafter described and claimed andin order that it may be understoodreference is to bechad .to the accompanying drawing, in which v Figure1, is a face view of a phonograph record embodying the preferred form ofthe invention.

Figure 2, is a similar but fragmental view of a record of modifiedconstruction.

Referring now to the drawing in detail, the record 1 of the usual typeand operation,

is provided in Figure 1, with a circular scoring or groove 2 disposedeccentrically to the axis 3 of the record and at its point most remotefrom such axis, intersecting one of the usual non-reproducing grooves 4innermost exsurrounded by the sound re-producing grooves 5 of the disk.

'ith this construction the said eccentric scoring or groove mayintersect the inner extremity of the spiral, reproducing groove if therecord lacks the customary additional inner grooves for guiding theneedle without an attendant sound reproduction.

In I*igure 2, the scoring 6, intersects either of the grooves mentionedas conventional in disk records, and curves inward from the .point ofintersection to avoid a too sudden or abrupt inward jump or accelerationof the nward movement of the needle and tone arm. the scoring thenext-ending as a chord or partial cord 7 of the innermost of thecustomary grooves. so that it shall at first continue the inward travelof the needle and then reverse such travel, accomplishing the result inthe same manner as the eccentric groove 2 but more rapidly, as itefiects the reverse or outward movement of the tone arm in less than ahalf revolution of the record as contrasted with the eccentric circulargroove which starts the outward swing of the tone arm at theend of ahalf revolution of the record. \Vith the chord type of groove it ispreferred that it shall intersect the innermost sound-reproducing grooveor one of the non-reproducing grooves at both ends. though it mayintersect at one end only, this being immaterial provided the brakeactuating mechanism of the phonograph functionsproperly. -It is alsodesirable that the scoring of either type or of any modificationthereof, shall beslightly deeper than the sound-reproducing andnonreproducing grooves, to insure the necessary reverse travel or swingof the tone arm. The

same principle of construction can be applied in connection with thecylinder type of record.

From the above description it will be apparent We have produced aphonograph record capable of imparting outward or reverse movement tothe tone arm, and it is 1 susceptible of modification in minorarticulars without departing from the principle of constructioninvolved.

We claim: I 1. A phonograph disk record provided on its face within thespace surrounded by the sound reproducing grooves, with a scoring orgroove for receiving thev needle of the tone arm after the needle hascompleted its inward travel in said rooves, to cause said needle to moveinward and then ouhvardly and impart correspondlng movements to the tonearm. 1

2. A phonograph disk record provided within the space surrounded by thesound reproducing grooves, with a circular scoring or groove disposedeccentrically of the axis of the record and at its point most remote 10from said axis, intersecting the normal path of travel of the needletocause the same and the tone arm to move inwardly within the space andthen outwardly.

TOM DOUGLAS JONES. JOHN H. BAR-R.

